\begin{figure}%[htp]
\centering
\subfigure[Memory Usage in Monitor Mode]{\label{fig:memory-monitor}
    \includegraphics[scale=0.5]{memory_monitor}}
\subfigure[Memory Usage in Scan Mode]{\label{fig:memory-scan}
	\includegraphics[scale=0.5]{memory_scan}}
\subfigure[Comparison of Memory Usage]{\label{fig:memory-comp}
    \includegraphics[scale=0.5]{memory}}
\caption{The Memory usage comparison of Monitor and Scan mode}
\label{fig:memory}
\end{figure}